Added input handler

src/inputHandler.c

@@ -0,0 +1,14 @@
+#include "inputHandler.h"
+
+int getOperationId(char symbol) {
+    int id = 0;
+    switch (symbol) {
+        case '+':
+            return 1;
+        case '-':
+            return 2;
+        case '*':
+            return 3;
+    }
+    return id;
+}

src/inputHandler.h

@@ -0,0 +1,6 @@
+#ifndef THEADMIRALS_INPUTHANDLER_H
+#define THEADMIRALS_INPUTHANDLER_H
+
+int getOperationId(char);
+
+#endif //THEADMIRALS_INPUTHANDLER_H